Abstract:

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SiO2 -TiO2 glass fibers have been prepared via dry spinning of the viscous solutions of
polytitanosiloxanes followed by steam treatment and pyrolysis at 500, 700, and 900 °C for 1 h
under ambient condition. The polymer was prepared via polycondensation of partially hydrolyzed
tetraethoxysilane (TEOS) and an acetylacetone-chelated titan compound at various H2O/TEOS and
Si/Ti ratios. Gel fibers formed shown tensile strength as low as 200 MPa and increased around 3
times after pyrolysis. The higher degree of TEOS hydrolysis the higher tensile strength of the
fibers. The polymer with higher Si/Ti ratio also provided stronger fibers due to more extensive
siloxane network. Fibers with the highest tensile strength, 610 MPa, was obtained from the
polymer synthesized with SiO2/TiO2 mol ratio 20 and pyrolysis temperature 700 °C.